Constructing Built-in Electric Field in Heterogeneous Nanowire Arrays for Efficient Overall Water Electrolysis.
Constructing Built-in Electric Field in Heterogeneous Nanowire Arrays for Efficient Overall Water Electrolysis.
复制标题
在异质纳米线阵列中构建内置电场以实现高效的整体水电解。
DOI：
10.1002/anie.202302795
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发表时间：
2023
影响因子：
--
通讯作者：
Shenlong Zhao
中科院分区：
文献类型：
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作者：
Shucong Zhang;C. Tan;Ruipeng Yan;Xifei Zou;Feilong Hu;Yan Mi;Cheng Yan;Shenlong Zhao
用于析氢和析氧反应的高效双功能电催化剂是水电解的关键。在此，我们报告了内置电场（BEF）策略来制造在碳纤维纸（Ni2P-CoCH/CFP）上生长的异质磷化镍-钴纳米线阵列，具有较大的功函数差（ΔΦ）作为整体分裂的双功能电催化剂。令人印象深刻的是，Ni2P-CoCH/CFP 对氢和氧反应分别表现出显着的催化活性，以获得 10 mA cm-2 的电流。此外，由 AAA 电池驱动的实验室规模电解槽在 50 小时电催化后具有出色的稳定性，法拉第效率为 100%。计算与实验相结合表明，界面感应电场效应有利于电荷的不对称分布，从而调节反应过程中中间体的吸附/解吸。这项工作为合理设计高性能多相电催化剂提供了一条途径。
Efficient bifunctional electrocatalysts for hydrogen and oxygen evolution reactions are key to water electrolysis. Herein, we report built-in electric field (BEF) strategy to fabricate a heterogeneous nickel phosphide-cobalt nanowire arrays grown on carbon fiber paper (Ni2P-CoCH/CFP) with large work function difference (ΔΦ) as bifunctional electrocatalysts for overall splitting. Impressively, Ni2P-CoCH/CFP exhibits a remarkable catalytic activity for hydrogen and oxygen reactions to obtain 10 mA cm-2, respectively. Moreover, the fabricated lab-scale electrolyzer driven by an AAA battery delivers excellent stability after 50 h electrocatalysis with a 100% faradic efficiency. Computational calculations combining with experiments reveal the interface-induced electric field effect facilitates asymmetrical charge distributions, thereby regulating the adsorption/desorption of the intermediates during reactions. This work offers an avenue to rationally design high-performance heterogeneous electrocatalysts.